os. ae 
acuminated, rather stiff but fragile, sharply toothed. Lamina probably up to 2 m 
long, dark green, membranous, deltoid or ovate-deltoid, quadripinnatifid below, 
tripinnatifid at the middle. Pinnz subopposite, at distances of 8—10 cm, the basal 
ones the largest, perhaps up to 1 m long on stalks 3—4 cm, with the lower side - 
produced. Middle pinnz short-stalked, lanceolate-oblong, acuminate. Secondary pin- 
nulz at nearly right angles to the costa, at distances of 2 cm, the lower pairs 
shortly petiolate, the middle sessile, the upper ones adnate to costa at the posterior 
base, the uppermost ‘ones decurrent, at least confluent, a middle pinnula oblong, 
acuminate 8—10 cm long, 2—2'/2 cm broad, pinnatifid nearly to the midrib. Ter- 
tiary segments close, nearly contiguous, separated by narrow, acute sinuses, 4—5 
mm broad, the edges nearly parallel from 
base to apex that is bluntly rounded at the 
posterior side, sometimes truncate or even 
emarginate, most of them perfectly entire, 
only the lower ones of the larger - pinnulz 
being more or less lobed, the lobes falcate ; 
posterior basal segment always somewhat 
reduced, the anterior one equal to the others. 
Veins 6—7 jugate, most of them furcate, 
terminating distinctly within the margin; 
the tips of veins form an oblong brown spot 
seen on the upperside (hydathode); midvein 
of an adnate, posterior segment springs out 
from the base of the costula or more often 
Fig. 13. Dr. subincisa (Willd.) Urban. Two secon- pera rs ar — oe — 
dary pinnule, nat. size, and sapheent seen from Coste amd costulee: “beneath. Hbrillose by 
both surfaces, >< 2; scale (the left-hand one) brown, linear or lanceolate-linear scales, 
from costa. All drawn after the type-specimen. With toothed margins and fimbriate round 
The right-hand scale from costa of f. Galeotti. the cordate base, teeth of margins variable 
(see below); scales clathrate with thick 
cell-walls, the cells nearly isodiametrical along the edges, longitudinal at the centre; 
outer cell-walls yellowish brown, the lumina, therefore, as a rule not clear as in 
the scales of D. ampla and its allies. Rachis above rusty pubescent with articulated 
Ctenitis-hairs, upwards like the cost above strigose by antrorse, subulate, often 
characteristically falcate, paucicellular, whitish or brownish, longer hairs. Similar 
but fewer hairs are found on the midribs of the segments and (more scattered and 
deciduous) on the veins above and also on the margins, upper surface otherwise 
glabrous. Costule beneath with similar but more patent and soft hairs, often shorter 
and longer intermixed; pubescence of underside rather variable (see below). — Sori 
rather small, exindusiate, about medial, on the anterior branch of a furcate vein, 
a little above the furcation. Spores densely and minutely papillose, : 
math 
Wa 
